#3C3F83
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.112 278.2), rgb(60, 63, 131).
Aa
White text reads best on this color (9.41:1).
About this color
#3C3F83 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.112 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.024 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #3C3F83 |
| RGB | rgb(60, 63, 131) |
| HSL | hsl(237, 37%, 37%) |
| OKLCH | oklch(40.2% 0.112 278.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3C3F83 | 9.41:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #3C3F83 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #3C3F83 text on white | 9.41:1 | AAA | Lc 91.6 | Preferred for body text |
| #3C3F83 text on black | 2.23:1 | Fails | Lc -10.8 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEB
oklch(80.9% 0.065 278.1)
-
Step 400
400
#919AE1
oklch(70.7% 0.104 277.8)
-
Step 500
500
#787FD9
oklch(63.1% 0.134 278.4)
-
Step 600
600
#6267C6
oklch(55.6% 0.145 278.3)
-
Step 700
700
#5155AB
oklch(49.1% 0.135 278.2)
-
Step 800
800 (this color)
#3C3F83
oklch(40.2% 0.112 278.2)
-
Step 900
900
#383B6F
oklch(37.7% 0.088 278.8)
-
Step 950
950
#202341
oklch(27% 0.056 277.7)
#3C3F83 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #1E4985 | 0.041 |
| Deuteranopia (no green cones) | #154382 | 0.043 |
| Tritanopia (no blue cones) | #1D4E5B | 0.097 |
| Achromatopsia (no color) | #464646 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C3F83
#3C3F83
oklch(40.2% 0.112 278.2)
- #544800
#544800
oklch(40.2% 0.083 98.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3C3F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.036
- Cobalt #1E488F ΔE 0.042
- Twilight Blue #0A437A ΔE 0.053
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.058
- Twilight #4E518B ΔE 0.060
- Dusk #4E5481 ΔE 0.070
Use #3C3F83 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.